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Chapter 16: Q8Q (page 662)

You travel along a path from location A to location B, moving in a direction opposite to the direction of the net electric field in that region. What is true of the potential difference VB-VA?(1)VB-VA>0,(2)VB-VA<0,(3)VB-VA=0.

Short Answer

Expert verified

The correct answer for potential difference is option (1)VB-VA>0.

Step by step solution

01

Concept/Significance of the potential energy.

The work done on or by a particular charge travelling across an electrical potential difference is known as electrical potential energy.

02

Determination of the true potential difference.

The electric field always points from the positive charge to the negative charge, and as the electric field direction is from B to A, it is concluded that B is on the positive side and A is on the negative side. the positive side has higher potential energy than the negative side.

So, the potential difference is negative when potential of point A is placed first which is given by,

鈭�V=VA-VBand,

The potential difference is positive when potential of point B is placed first which is given by,

鈭�V=VB-VA

Thus, the correct answer for potential difference is option (1)VB-VA>0.

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Most popular questions from this chapter

In a circuit there is a copper wire 40 cm long with a potential difference from one end to the other end of 0.01V. What is the magnitude of electric field inside the wire?

A capacitor consists of two charged disks of radiusR separated by a distances, whereR>>s. The magnitude of the charge on each disk is Q. Consider points A, B, C, and D inside the capacitor, as shown in Figure 16.88. (a) Show that螖V=VC鈭�VAis the same for these paths by evaluating 鈭哣 along each path: (1) Path 1:A = B = C, (2) Path 2:A=C, (3) Path 3:A=D=B=C. (b) If,Q=43鈥坝糃,R=4鈥尘,s1=1.5鈥尘m ands2=0.7鈥尘m, what is the value of螖V=VC鈭�VA? (c) Choose two different paths from point A back to point A again, and show that鈭�V=0for a round trip along both of these paths.

An electron starts from rest in a vacuum, in a region of strong field. The electron moves through a potential difference of 44V. (a) What is the kinetic energy of the electron in electron volts (eV)? (b) Which of the following statements would be true if the particle were a proton? Choose both if they are both correct. (1) The kinetic energy of the proton would be negative. (2) The proton would move in the opposite direction from the electron.

The diagram in Figure 16.74 shows three very large metal disks (seen edgewise), carrying charges as indicated. On each surface the charges are distributed approximately uniformly. Each disk has a very large radius R and a small thickness t. The distances between the disks are a and b, as shown; they also are small compared to R. Calculate V2-V1, and explain your calculation briefly.

A rod uniformly charged with charge -q is bent into a semicircular arc of radius b, as shown in Figure 16.97. What is the potential relative to infinity at location A, at the center of the arc?

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